RFR: 8263856: Github Actions for macos/aarch64 cross-build [v2]

[Erik Joelsson]

On Tue, 6 Apr 2021 06:22:47 GMT, Anton Kozlov <akozlov at openjdk.org> wrote:

>> Please review a change that adds cross-compiled macos/aarch64 platform build into Github Actions test workflow.
>> 
>> The steps are basically copy-paste of macos/x86-64 build with the necessary platform name adjustments. Xcode 12.4 is also used for as macos/aarch64 build.
>> 
>> I've checked the produced build (can be found in https://github.com/AntonKozlov/jdk/actions/runs/667527036), it starts on the actual aarch64 machine.
>
> Anton Kozlov has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:
> 
>  - Specify Xcode version; don't use --extra-{c,cxx,ld}flags
>  - Merge remote-tracking branch 'upstream/jdk/master' into 8263856-gha-macos-aarch64
>  - Add macos/aarch64 build workflow

Marked as reviewed by erikj (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/3270